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WATCH LIVE: Obama marks the 50th anniversary of the March on Washington

The White House has offered few clues about what the president will say.

In a radio interview earlier this week, Obama said he would look to “remind people that the work is still out there for us to do, and that we honor his speech but also, more importantly in many ways, the organization of the ordinary people who came out for that speech.”

White House adviser and Obama confidante Valerie Jarrett told Time magazine that the president sees himself as “on the shoulders of those who came before him,” and the speech as an opportunity to propel the next generation toward action.

“Each generation has an obligation to pick up the baton,” Jarrett says. “We want young people to feel a sense of responsibility to take that baton and run with it.”